Document Detail

Are there ecological implications for the proposed energetic restrictions on photosynthetic oxygen evolution at high oxygen concentrations?
MedLine Citation:
PMID:  17611812     Owner:  NLM     Status:  MEDLINE    
It has recently been shown that, in subthylakoid particles prepared using detergent, there is inhibition of oxygen production reactions in photosynthesis by thermodynamic feedback from oxygen build-up, with 50% inhibition at 230 kPa partial pressure of oxygen. This article presents a comprehensive analysis of laboratory data on the effects of high oxygen partial pressures on photosynthesis, and on photo-lithotrophic and chemo-organotrophic growth, of oxygen-producing organisms. The article also contains an analysis of the extent to which high oxygen concentrations occur at the site of photosystem II (PSII) activity under natural conditions today and in the past. The conclusion is that the oxygen concentrations found in nature are very unlikely to reach that needed to cause 50% inhibition of the photosynthetic oxygen production reaction in subthylakoid particles, but that it is just possible that a small part of the inhibition of photosynthesis and of photo-lithotrophic growth by oxygen can be attributed to inhibition of oxygen production by PSII.
J A Raven; A W D Larkum
Publication Detail:
Type:  Journal Article     Date:  2007-07-05
Journal Detail:
Title:  Photosynthesis research     Volume:  94     ISSN:  0166-8595     ISO Abbreviation:  Photosyn. Res.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-08-21     Completed Date:  2007-12-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954728     Medline TA:  Photosynth Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  31-42     Citation Subset:  IM    
Plant Research Unit, University of Dundee at SCRI, Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, UK.
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MeSH Terms
Oxygen / metabolism*
Photosystem II Protein Complex / metabolism
Reg. No./Substance:
0/Photosystem II Protein Complex; 7782-44-7/Oxygen

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